该程序的功能是实现交通灯，L0.0 主路红灯 L0.1 主路黄灯 L0.2 主路绿灯 L1.0 支路红灯 L1.1 支路黄灯 L1.2 支路绿灯-The functionality of the program is to achieve the traffic lights, L0.0 main road red L0.1 main road yellow L0.2 main road green L1.0 slip the red L1.1 slip the y